Filter



Aug. 23. 1927'.

J. M. LOBlT FILTER Filed Nov. 14, 1925 To @rure/ar INVENTOR Jean ML obi/1 M Mm/W ATTORNEYS Patented Aug. 23, 1927.

UNITED STATES PATENT OFFI-(IE.

JEAN MZ LOBI'I, BROOKE, NEW" YORK;

FILTER.

Application filed. November 14,1923; SerialNo. 674,670..

This invention relates to filtering devices.

More specifically it relates to filtering devices for use between the liquid-fuel supply readily cleaned. To these and other ends.

as will hereinafter appearthe invention consists in the novel features and combinations hereinafter described.

The figure shows a longitudinal section through the device.

Referring to the drawings which illustrate, in sectional elevation, what I now consider a preferredform of theinvention. the filtering device comprises a cylindrical casing or chamber 15 arranged vertically and having a dome-shaped top provided with means, in the form of an interiorly threaded neck 16, for connection with the pipe or conduit 19, in which the cock or valve 14 is interposed. The conduit 19 serves to convey gasoline or other liquid fuel from the supply tank (not shown) of the internal combustion engine to the. filter chamber 15. The lower end of the chamber 15 is internally threaded to receive a plug 17 which forms a liquid-tight seal at the bottom of the chamber when screwed into the latter. An outlet conduit 18, screwed into the side of the casing 15 above the bottom thereof, serves to convey the filtered liquidfuel from the filter chamber to the carburetor (not shown) of the engine.

The filtering element- 20 is a brush which fitst-he bore of the cylinder or chamber 15 snugly, i. e., the brush-before insertion into the chamber is of slightly greater diameter than the chamber. While other types of brushes may be employed for this purpose, I prefer at present to employ a helically wound brush. as illustrated. The brush 20 consists of two wires or metallic rods 21 twisted around each other, the bristles being gripped or clamped between the two wires to form a helix or screw of bristles. In other words, the bristles are arranged to form substantially a square-threaded screw. The bristles may be made of hair, wire. fibre, hemp or other suitable material. The wires 21 are secured at one end to the plug 17.

Assuming that the parts are assembled, as shown in the drawings, and the valve or cock 14. open, uid" enters the chamber 15 through. the con uit 19 andlea'ves' at 18.

In its passage from the inletI9 to the outlet 18 the liquid' must pass through the brush or filtering element 20. Normally the liquid.

passes substantially vertically downward through the brush 20. However,if the bristles have become clogged with particles of solid foreign matter to such an extent as to impede or prevent such vertical downward travel of the liquid, nevertheless the liquid will be permitted to flow through the filter, in this case through the helical path or conduit formed by the bristles. In either case all solid and foreign particles will be removed from the liquid in its passage through the brush 20. By virtue of the construction of the brush or filtering element 20, the danger of complete clogging between the inlet and outlet is greatly reduced if not entirely eliminated. This is especially important when the device is used on aircraft making long non-stop flights. The device need not be inspected except at comparatively longintervals of time.

By unscrewing the plug 17 the. brush 20, is simultaneously rotated in and moved longitudinally of the chamber 15. The bore or inner wall of the latter is thus effectively scoured and cleaned and all dirt and foreign matter removed therefrom upon withdrawal of the plug and brush. The brush may then be readily cleaned and reinserted or, if desirable, replaced by a new brush.

In accordance with the provisions of the patent statutes. I have herein described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiments thereof, but I desire to have it understood that the apparatus disclosed is only illustrative and thatthe invention can be carried out by other means.

What I claim is:

1. A filter comprising in combination, a casing having a substantially vertical bore and a pipe plug closing the lower end thereof, a filter brush secured to said plug and extending into said bore, an inlet conduit communicating with said bore above said brush, and an outlet conduit communicating with said bore below said brush but above said plug. I

2. A filter comprising in combination, a casing having a substantially vertical bore and a pipe plug closing the lower end thereof, a helical filter brush secured tosaid plug and extending into said bore, an inlet con-- outlet conduit to pass from oneend of said brush to the other, said means comprising a casing in which said brush is mounted a detachable closure at one end of said casing,

j said brush being secured to said closure and removable withsaid closure through the last let conduit being in communication with the interior of said casing above said closure.

In testimony whereof I hereto aflix my signature.

JEAN M. LOBIT.

mentioned end of said casing, and said out- 

